Indoor single-phase epoxy resin casting current transformer complying with GB/T20840.1/2 and IEC61869-1/2 standards; rated insulation level 24/65/125kV, rated frequency 50/60Hz, rated secondary current 5A or 1A. Optional primary current covers 20–2000A; accuracy-class rated outputs: 10VA for 0.2(S)/0.5(S), 15VA for 10P15; short-time thermal current ranges 31.5–100kA, rated dynamic stable current ranges 80–160kA; product weight:36.5kg; ambient operating temperature -5℃~+40℃.
Indoor epoxy resin current transformer for 12kV systems, suitable for metering and protection in MV switchgear.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LZZBJ9-20-180b-3 | Factory nameplate marking |
| Primary Voltage | 10kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A/1A | Ratio check at rated frequency |
| Accuracy Class | [On Request] | Accuracy test (IEC 61869-2 / IEEE C57.13) |
| Rated Burden | [On Request] | Burden test at rated VA |
| Insulation Type | Dry Epoxy Resin | Dielectric tests per standard |
| Insulation Level (BIL) | 12/42/75kV | Power-frequency & lightning impulse withstand |
| Standards | [On Request] | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | Ambient: -5℃~+40℃ | Per datasheet limits |
Ideal For
Not Recommended For
Connect primary in series with the line. Secondary terminals: 1S1-1S2 for metering, 2S1-2S2 for protection. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point.
Compliant with: [On Request]
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level?
A: The insulation level is 12/42/75kV, meaning 12kV system, 42kV power-frequency withstand, 75kV lightning impulse withstand.
Q: What are the available secondary currents?
A: Secondary current is 5A or 1A, selectable.
Q: Is it suitable for outdoor use?
A: No, it is designed for indoor use only.
Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.
| Rated primary current I1n (A) | Accuracy classCombined | 0.2(S) | 0.5(S) | 1J/P15 | Short-time thermal current Ith (kA/S) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 20-200 | 0.2(S)/0.2(S) | 10 | 10 | 15 | 150 I1n | 375 I1n | 36.5 |
| 300 | 0.2(S)/0.5(S) | 10 | 10 | 15 | 31.5 | 80 | 36.5 |
| 400-500 | 0.2(S)/0.5(S) | 10 | 10 | 15 | 45 | 110 | 36.5 |
| 600-800 | 0.5(S)/10P | 10 | 10 | 15 | 63 | 130 | 36.5 |
| 1600-2000 | 0.5(S)/10P | 10 | 15 | 15 | 100 | 160 | 36.5 |
Dimension & outline drawing of LZZBJ9-20-180b-3 — click image to zoom / view original.
